Ownership!!!
The catch might be the fact that SAS owns BMI, or part of it anyway..
However, dont mix up SAS as a whole and the airlines, the company owns several airlines now..( SAS-sweden, SAS-intercont, SAS-denmark, SAS/BU-norway, snowflake, Blue 1, Widroe, Spanair, Air botnia and parts of others like BMI.)
One can vanish and the others prosper, in theory..